helm chart for cht sync

[witash]

this branch contains

1. a helm chart for deploying cht sync on kubernetes. including logstash, postgrest, and dbt containers for all deployments optionally a postgres db and service and experimentally a redis instance and the redis worker to copy data from it

2. change to the github task which was building and pushing images with the :latest tag on every push on every branch, which causes problems for deploying on kubernetes; for now, it just tags images with the branch name, we can make additional changes in its own branch after this is merged.

3. creates the couchdb database in the dbt worker.

Closes #75

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[witash]

this is not totally final because there isn't a good way to access the postgres db in the cluster (see #87). but I want to merge this to main since #79 depends on it and the github build task in main keeps overwriting the latest images with feature branches. in the meantime, you can access the database for testing and development if you have kubectl access kubectl exec -it -tty postgres-xxxx -- psql

[andrablaj]

@witash, is this PR ready for re-review? If yes, re-request review from @dianabarsan or any other people who should have a look at this.

[medic-ci]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: